Error category
Fix Cursor editor, chat, model access, authentication, provider configuration, and AI coding workflow errors without relying on client-side search.
This Cursor troubleshooting hub collects real error signatures, quick fixes, common causes, and step-by-step debugging paths for developers who need a practical answer instead of a broad overview.
41 crawlable articles in this category. 56 additional records are indexed in JSON only (no standalone HTML route).
Browse Cursor records in the data catalog — search JSON index entries, including data-only records without standalone HTML guides.
Start by matching the exact error message, then check the technology, environment, credentials, network path, and deployment context. The pages below are grouped so you can move from broad Cursor symptoms to specific root-cause families without relying on client-side search.
Evidence labels are derived at build time from each Markdown record. Source-backed entries have public URLs under a Sources checked section, while partial-source entries expose public links without a complete source block.
These entries include public source URLs in the imported page body. Use them first when you need evidence for provider behavior, SDK regressions, or version-specific failures.
Cursor IDE 用户面临多种错误（API key 无效、模型不可用、网络超时），需要系统性的故障排除指南来恢复 AI 辅助编程功能。 Includes evidence for Cursor troubleshooting demand.
Invalid API Key / Model not available or Unsupported model / Request timeout / Connection failed / Network error Fix Cursor IDE crashing repeatedly (code 5) after extended agent/composer sessions, caused by memory leak or SQLite nested transaction bug Includes evidence for Cursor troubleshooting demand.
Cursor crashed (code 5) | Renderer OOM when agent turn loads many file contexts + large writes | RangeError: Invalid array length in setCardContentReady crashes renderer (code 5) Developer updates Cursor IDE to v3.0 or v3.1 and suddenly no models show up in the agent window, while web version still works. Needs to fix EverythingProvider timeout and restore model access. Includes evidence for Cursor troubleshooting demand.
Timeout waiting for EverythingProvider — no models appear in Cursor IDE after updating to v3.0/v3.1 Fix Cursor IDE repeatedly failing with 'unable to reach the model provider' error requiring constant restarts Includes evidence for Cursor troubleshooting demand.
Unable to reach the model provider / We're having trouble connecting to the model provider — repeats after every new prompt until Cursor is restarted Developer needs to restore Cursor IDE model connectivity (O3, Claude, Auto) after receiving region-restriction or connection error Includes evidence for Cursor troubleshooting demand.
"Model not available" / "We're having trouble connecting to the model provider" / "This model provider doesn't serve your region" Fix Cursor editor where no AI models work despite correct network — requires troubleshooting model provider API key status, subscription tier, or backend outage Includes evidence for Cursor troubleshooting demand.
model service unavailable / model not available (all models affected) Debug why Cursor cloud agent falls back to default base image after environment configuration fails; fix Dockerfile-based env setup with build secrets Includes evidence for Cursor troubleshooting demand.
Environment configuration failed — agent defaults to base image with warning signs instead of running in configured environment Fix Cursor IDE Claude Code extension disconnecting immediately after launch, /ide command returns no available IDEs Includes evidence for Cursor troubleshooting demand.
[ERROR] MCP server "ide" Failed to fetch tools: MCP error -32000: Connection closed ... (repeats indefinitely) Fix Cursor IDE streaming disconnections causing incomplete code completions Includes evidence for Cursor troubleshooting demand.
Cursor IDE: "Connection lost while receiving response" or stream disconnect error during AI code suggestions Developers using Cursor's automated agent face accidental main-branch writes when the agent skips creating a feature branch. Need to understand how this happens and prevent data loss Includes evidence for Cursor troubleshooting demand.
commits land on main when Cursor implementer skips feature branch creation Fix API key rejected by Cursor IDE despite being valid elsewhere (works in other apps); need resolution for paid Cursor subscription users. Includes evidence for Cursor troubleshooting demand.
We encountered an issue when using your API key: Streaming error Fix Cursor IDE refusing to use custom models (GPT-4, Claude) when custom API key (BYOK) mode is enabled, particularly breaking Agent and Edit features that depend on custom models Includes evidence for Cursor troubleshooting demand.
The model gpt-4 does not work with your current plan or api key Fix unexpected negative balance and access denial on Cline's free tier model endpoints Includes evidence for Cursor troubleshooting demand.
"Insufficient balance" showing balance of $-0.1 for free model usage Fix Cursor IDE crash caused by spawning concurrent Claude Code processes inside the editor Includes evidence for Cursor troubleshooting demand.
[Bug] Cursor IDE crashes/becomes unresponsive when running multiple concurrent Claude Code CLI instances within Cursor Fix Cursor IDE connection failure caused by HTTP/2 incompatibility on corporate networks, VPNs, or Zscaler proxies Includes evidence for Cursor troubleshooting demand.
Connection failed. If the problem persists,... — Cursor HTTP/2 connection failure on corporate VPN/proxy networks Paid Cursor subscription user cannot access Claude Sonnet 4.5 due to geographic region restriction; seeks workaround or alternative model provisioning Includes evidence for Cursor troubleshooting demand.
Model not available: This model provider doesn't serve your region. Visit https://docs.cursor.com/account/regions Fix Cursor MCP Connection Failed error; developer needs to quickly restore AI assistant functionality by resolving port conflicts, zombie processes, or config path issues Includes evidence for Cursor troubleshooting demand.
MCP Connection Failed — Unable to establish a connection to the MCP server. Check your MCP configuration in Settings > MCP. Fix Cursor MCP servers failing with silent error -32000 Connection closed; need to discover exact underlying cause by running npx command manually outside Cursor IDE. Includes evidence for Cursor troubleshooting demand.
MCP error -32000: Connection closed — Cursor silently fails to start MCP server via npx Fix Cursor IDE showing persistent model-unavailable error after switching providers or updating API keys, particularly Claude models Includes evidence for Cursor troubleshooting demand.
the model default does not work with your current plan or API key Fix API key request errors when configuring custom/third-party models in Cursor IDE settings Includes evidence for Cursor troubleshooting demand.
With custom model API key get request error — configured third-party model returns request failures Continue through the full static archive for this hub. Every listed page is crawlable and keeps its existing canonical URL.